Rotatable tool holder for lathes



J.- c. S TEI'NER. ROTATABLE'YTOO'L HOLDER FOR LATHES. 1

APPLIQALHON FILED 1AN.20, 1919-, 1,425,804. Patented Aug 15,1922.-

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1. 0'. STEINER. ROTATABLE TOOL HOLDER FOR LATHES.

APPLICATION FILED JA ,4 5, Patented Aug. 15,1922.

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Josnrn c. stunrnnn, or sit. Louis, Missouri-r. 1

ROTATABLE TOQL HOLDER FOR LllTI-IES.

Application, filed iTanuary'ZO, 1919. Serial No. 272,017.

tion,reierencebeinghad to the accompanydrawings, forming a part of this specification. a

My invention relates to improvements in rotatable tool holders for lathes, the main object being to produce a simple rotary. tool holder whereby a variety of tools. may be firmly secured, in many different positions, with their cutting edges posit oned to per form difi erent operations on the work. In the preferred form of the invention, a large open tool-receiving space is torr'nedaround the axis of the rotatable tool holder and the tools. or 'rou asof tools. ma be adm i usted to any desired positlons n this space and thenfirm-ly secured to-the holder. For example, a group of tools maybe properly adjusted and secured to perform an initial or rough cutting operation and a second groupv of tools may be secured toperform the finishing operation. In this event, the

tools of one group will;act siznultaneously on the work, and after one operation has,

been performed therotary tool holder will be turned on its axis to present the other groupof tools to'the work. lhe'tools may be so positioned that a single too]. willed operate with a group of tools, or a single tool may be held in a peculiar or unusual position. I v

The tool holder I have shown to illustrate the invention is provided with a horizontal tool-receiving face, and the tools can be adjusted to any desired positions on this face and then firmly secured to the tool'holder. The pivot tor the rotatable tool holder lies entirely below the tool-a'eceir ing face, so it does not in any way obstruct the tools. To firmly hold the tools and, prevent them from vibrating or chattering, 1 preferably use a relatively large strong pivot for the tool holding table, and this is a desirable feature in a device of thiskind. However, the tools lie above the large pivot member, so the pivot does not occupy the tool-receiving space. This enables tools to be freely adjusted inthe piyotallymoun ted tool holder. If desirable, one of-thetools Specification 01" Letters Patent. Patgntgd Aug;

comprisesqa horizontal table-l provided can extend across the axis o1 the pivot, while the others may lie directly abovethe' large I pivot member. I y i A further ob ect is to provide an in -Q proved clamping'means whereby the simple.

rotary tool holder is firmly secured in the l positions to which ityis adjusted.

Fig. lis a top or plan view ota rotatable toolholder embodying the -1"?eatu-res ofthis invention. s 5 l Fig. 11 is aliorizontal I proximately onthe line ll' ll, Fig. III;

section taken'eu- Fig. III is a vertical section taken ap proximately on the linejllI'.-lll, .Figfll. In Fig. 111 of the drawings, A designates a portionof the carriage of a lathe,'ian;d B 5 designates a. cross slide-mounted on the carriage. and torming a.base,;or bearin-g, forf p the. rotatable tool-holders The tool holder with a large pivot member 2 which: extends into the base. The pivot member QexteLnds downwardly from the table 1 and it lies entirely below said table. designates a seat located around the aXisof the pivot" or screws 4. The clamping devi'cdafior {seq member and secured to the "base Icy-means curing, the tools comprises a screw-holding block amounted abovethe table 1 and sepf arate'd the-refromto provide a large, open tool-receiving space wherein. the tools 1T nay be treelyad-justed. 6 designates clamping screws mounted.- in the block 5fland o t-1E I clamp: the tools onto. the horizontal top tending into the tool-receiving space to face of the table 1. These screws 6; arelecajte'd atvarious points around the axis oi? the 'toolholdergso as to. secure the tools in the many different positions to which they may be adjusted. The lower ends of the screws 6' engage; the tools and their upper ends areexposed above; the block 5 to receive a wrench, or other; ad1ust1ngtoolJ Tension screws 7, connectlngthe block 5 to the 'tabl'e'l, are preferably surrounded by separating. tubes "8 whichlie between thetable 1 and the block 5 to retain the latter in theelevaited position shown in, Fig. III. The tubes S preventthe block 5 from drop ping toward the, table whenv thexserews 6 are disengaged from the. tools. .When the; screws 1. v

6 are ti .ghtened on the tubes screws 7 are. 9

placed under tension, butthe blocks does not rise orfall in; response to the forcesto l iich t e. crew ar subj ted.

In Figil Ihave-shown the; .WOrk' W by dotted lines, and it will be observed that the three tools T shown by full lines may be readily positioned and secured to act upon three different faces of the work. Different groups of tools may be positioned in the tool holder to [)BlfOl'lll successive cutting op erations, or single tools may be entnded from the tool holder, as shown by dotted lines in I. Obviously, the tools may be adjusted to almost any desired position in the large open space between the table 1 and the block 5, and the tools may be extended into this space far enough to be firmly seated on the table 1. A very large number of the screws 6 may be located around the axis of the tool holder so as to firmly secure the different tools which may extend in various directions from the different sides of the table 1. After one operation has been performed, the rotary tool holder may be turned on its axis to present another tool, or group of tools, to the work.

A ring 9 (Figs, 11 and III) is secured by means of screws 10 to the lower end of the pivot 52, and the peripheral face of this ring is provided with vertical slots 11 for the reception of a latch pin 12 slidably mounted in the base B. In the structure I have shown there are eight slots 11 in the ring 10, and the latch pin 12 will therefore pass into a slot 11 when the tool holder occupies any one of eight different positions. The means for operatin the latch pin 12 comprises a lever 13 fulcrumed at 14 and pivotally connected to the latch pin. A spring-receiving pin 15 IT), pivoted to one end of the lever 13, extends into a pocket containing a spring 16 whereby the latch pin 12 is yieldingly held in the operative position shown by Figs. H and Ill.

ll will now describe the means whereby the "rotatable tool holder is firmly clamped to the base E and positively prevented from vibrating, or chattering, when the tools are in service. The lower portion of the pivot 2 is provided with a beveled annular face 17, formed concentric with the axis of the pivot, and a contractible clampin ring, consisting of semicircular sections 18 and 19, has a beveled inner face which cooperates with the beveled face 17. The contractible clamping ring lies in an annular groove in the face B, and the seat 3 (Fig. TIT) forms the top wall of this groove. The semicircular ring sections 18 and 19 are united through the medium of a connecting screw 20 passing through opposing ends of the ring sections,

and a clamping screw 21 whereby the other ends of said sections are connected. The ring section 19 is threaded to receive the screws 20 and 21, and the ring section 18 is provided with relatively large openings for said screws. Each of these screws 20 and 21 is provided with an abutment shoulder 22, which engages a similar shoulder in the ring section 18. An operating handle 23 is secured to the clampin screw 21', and the connecting screw 20 may be adjusted to vary the operative positions of this handle 23. If the screw 20 is properly adjusted, the operator can retain the handle 23 in positions where it may be most conveniently manipulated to contract the clami iing ring.

W hen the split clamping ring 18-19 is contracted through the medium of the screw 21., the beveled inner face of said ring cooperates with the corresponding bevel 17 on the pivot 2 (Fig. TH), and the ring tends to move upwardly on the beveled face 17, while the pivot tends to move downwardly. The tool-receiving table 1 is thus firmly forced onto its large seat 3, while the ring 1819 is forced into firm engagement with the pivot and also with the seatmember '3. A study of Fig. HT will show that the split ring very efiectively cooperates with pivot 2, so as to very firmly secure the rotatable tool holder to the base B. I

I claim:

1. In a rotatable tool holder for lathes, a horizontal tool-receiving table, a screw holder mounted above said'table and separated therefrom to provide a large open tool-receiving space, tension members extending across said space and connecting said screw holder to said table, vertical clamping screws mounted in said screw holder and extending into saidopen space to clamp the tools ontosa-id table, a vertical pivot located at the center of said table and extending downwardly from the bottom of said table, one of said clamping screws being located in said open tool-receiving space at a point directly above said pivot, and the other clamping screws being located at various points around the axis of'said pivot,

the large open tool-receiving space being formed directly above said pivot and entirely around said axis so as to allow the tools to extend directly across said axis and in various directions from the different sides of the table, said pivot lying entirely below said tool-receiving space and having its periphery cylindrical for a portion of its length, said periphery being beveled to provide a circular cam face concentric with the axis of the pivot, a stationary seat for the table located around the axis of said pivot, said seathaving plane bottom and top faces and a circular inner face closely fitted'to the cylindrical portion of the pivot so as to form a bearing therefor, and a contractible split cam ring cooperating with said beveled cam face on the pivot and also with the plane bottom face of said seat to force said'table into firm engagement with the plane top face of said seat, said seat being interposed between said cam ring and table.

2. In a rotatable tool holder for lathes, a horizontal tool-receiving table, a screw s in various directions from the different sides of the table, said pivot lying entirely holder mounted above said table vertical spacing sleeves interposed between said screw holder and table to provide a large open tool-receiving space, vertical tension screws extending through said spacing sleeves to connect said screw holder to said table, vertical clamping screws mounted in said screw holder and extending into said open space to clamp the tools onto said table, a vertical pivot extending downwardly centrally of the bottom of said table, one of said vertical clamping screws being located at the axis of said pivot and the other vertical clamping screws being located at various points around the axis of said pivot, and the large open tool-receiving space be ing formed directly above said pivot and entirely around said axis so as to allow the tools to extend directly across said axis and below said tool-receiving spaee, and having being peripherally beveled to provide a circularcam face concentric with the axis of a bearing therefor, and a contractible split cam ring cooperating with said beveled cam the pivot, a stationary seat for the table formed around the axis of the pivot, said 30 '7 cylindrical face of the pivot so as to formface on the pivot and alsoywith. the bottom face of said seat'to force said table into firm engagement with the plane top face of said seat, said seat being interposed between said cam ring and table.

In testimony that I claim the foregoing I hereunto aflix my signature.

JOSEPH e. STEINER. 

